Rajab 1. Birth anniversary of Imam Muhammad ibn Ali AS, Baqir al-Ulum (The Revealer of Knowledge). (Abu Ja'far أبو جعفر) Congratulations. This event is according to US and Canada, and in other countries Rajab 1 could be one day earlier or one day later, so please check with your local authorities. The 5th of the Twelver Shia Imams.